Modeling of Saturation Due to Main and Leakage Flux Interaction in Induction Machines

Abstract

Abstract-Saturation due to the main flux and rotor leakage flux interaction appears in induction machines, especially if the rotor slots are skewed or closed. Conventional saturation models used in connection with dynamic equivalent-circuit models do not take this phenomenon into account. In this paper, explicit functions for modeling this mutual saturation are proposed. These functions are physically reasonable, they are easy to fit, and the number of their parameters is small. The proposed functions can be used in real-time applications and in computer simulations if high accuracy and physical consistency are preferable. The model fits well to the data obtained from finite element analysis or experimental data of a 2.2-kW motor. The model predicts the stator current with good accuracy both in steady state and in transients.

Inclusion of magnetic saturation in dynamic models of synchronous reluctance motors

“…In the implemented model in [16], the total number of parameters in (17) was 13. In addition to (17), separate models for the incremental inductances were applied. Typically, the accuracy of polynomial models deteriorates significantly outside the range of the data, which can be a limitation in some applications.…”

“…The model has only nine parameters in total. A similar modeling approach has been used in connection with induction motors [17].…”

Frequency-Domain Maximum-Likelihood Estimation of High-Voltage Pulse Transformer Model Parameters

“…For the identification program automation, the measured k sat coefficient can be fitted with a polynomial function or with a simple two-parameter (a and b) function as in (10) [26] …”

Online Identification of Parameters Defining the Saturation Characteristics of Induction Machines

“…As a result, both the stator inductance and the rotor leakage inductance are dependent on the rotor current [19]. The loaddependency of the inductances can be modeled according to [20] …”

“…The parameter values used in the figure are given in Table I. The parameters necessary for including the influence of the torque were obtained from [20], where the same machine as used in this paper was analysed under loaded conditions. In this paper, the model in (11) is used since it has only three parameters.…”